which is correct?

[Dencology]

Which of the following is a difference between physical and chemical changes?

A In chemical changes, the mass before the reaction is greater than the mass after the reaction. In physical changes, the mass never changes.

B In chemical changes, new substances with new properties are made. In physical changes, the substance is still the same but in a different form.

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[doc3232]

Which of the following is a difference between physical and chemical changes?

A In chemical changes, the mass before the reaction is greater than the mass after the reaction. In physical changes, the mass never changes.

B In chemical changes, new substances with new properties are made. In physical changes, the substance is still the same but in a different form.

B for sure, mass can never change.